gearmulator

commit 92695072116ae26dc922b6e9b2bfdbb07d30e166
parent 7e7592755d354921f38c2d6c1e13f07c646d9694
Author: dsp56300 <dsp56300@users.noreply.github.com>
Date:   Fri, 16 Jul 2021 22:31:13 +0200

set FPU bit to flush denormals to zero

Diffstat:
M
source/synthLib/os.cpp
 | 
16
+++++++++++++++-
M
source/synthLib/os.h
 | 
1
+
M
source/synthLib/plugin.cpp
 | 
4
++++

3 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/source/synthLib/os.cpp b/source/synthLib/os.cpp
@@ -1,6 +1,7 @@
 #include "os.h"
 
 #include "../dsp56300/source/dsp56kEmu/logging.h"
+#include "../dsp56300/source/dsp56kEmu/buildconfig.h"
 
 #ifndef _WIN32
 // filesystem is only available on Mac OS Catalina 10.15+
@@ -23,7 +24,11 @@
 #	include <dlfcn.h>
 #endif
 
-#pragma optimize("",off)
+#ifdef _MSC_VER
+#	include <cfloat>
+#elif defined(HAVE_SSE)
+#	include <immintrin.h>
+#endif
 
 namespace synthLib
 {
@@ -177,4 +182,13 @@ namespace synthLib
 
 		return std::string();
 	}
+
+	void setFlushDenormalsToZero()
+	{
+#if defined(_MSC_VER)
+		_controlfp(_DN_FLUSH, _MCW_DN);
+#elif defined(HAVE_SSE)
+		_MM_SET_FLUSH_ZERO_MODE (_MM_FLUSH_ZERO_ON);
+#endif
+	}
 }
diff --git a/source/synthLib/os.h b/source/synthLib/os.h
@@ -5,4 +5,5 @@ namespace synthLib
 {
 	std::string getModulePath();
 	std::string findROM(size_t _expectedSize = 524288);
+	void setFlushDenormalsToZero();
 }
diff --git a/source/synthLib/plugin.cpp b/source/synthLib/plugin.cpp
@@ -3,6 +3,8 @@
 
 #include <cmath>
 
+#include "os.h"
+
 using namespace synthLib;
 
 namespace synthLib
@@ -67,6 +69,8 @@ namespace synthLib
 		if(!m_device->isValid())
 			return;
 
+		setFlushDenormalsToZero();
+		
 		processMidiClock(_bpm, _ppqPos, _isPlaying, _count);
 
 		float* inputs[8] {};